JEWEL TOOL Diamond and Pearl Gauge (TJ9120). This instrument embodies the epitome of accuracy and professionalism, ensuring that every measurement you make, whether it's for a diamond or a pearl, is spot-on. Crafted from durable plastic, the gauge promises longevity and consistent performance. Its design features dual sides to cater to the various needs of jewelry professionals and enthusiasts alike. One side provides measurements ranging from 0.02 to 6 carats, designed explicitly for diamonds. The flip side caters to pearls, with a scale that spans from 1/2 to 40 grains. In addition to these specialized scales, the gauge also boasts a metric measuring scale. This feature not only enhances the versatility of the tool but also ensures that it can cater to a global audience, making conversions and cross-references effortless.